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<a name="asio.reference.ip__multicast__hops"></a><a class="link" href="ip__multicast__hops.html" title="ip::multicast::hops">ip::multicast::hops</a>
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<p>
        <a class="indexterm" name="asio.indexterm.ip__multicast__hops"></a> 
Socket option for time-to-live
        associated with outgoing multicast packets.
      </p>
<pre class="programlisting">typedef implementation_defined hops;
</pre>
<p>
        Implements the IPPROTO_IP/IP_MULTICAST_TTL socket option.
      </p>
<h5>
<a name="asio.reference.ip__multicast__hops.h0"></a>
        <span><a name="asio.reference.ip__multicast__hops.examples"></a></span><a class="link" href="ip__multicast__hops.html#asio.reference.ip__multicast__hops.examples">Examples</a>
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<p>
        Setting the option:
      </p>
<pre class="programlisting">asio::ip::udp::socket socket(io_context);
...
asio::ip::multicast::hops option(4);
socket.set_option(option);
</pre>
<p>
        Getting the current option value:
      </p>
<pre class="programlisting">asio::ip::udp::socket socket(io_context);
...
asio::ip::multicast::hops option;
socket.get_option(option);
int ttl = option.value();
</pre>
<h5>
<a name="asio.reference.ip__multicast__hops.h1"></a>
        <span><a name="asio.reference.ip__multicast__hops.requirements"></a></span><a class="link" href="ip__multicast__hops.html#asio.reference.ip__multicast__hops.requirements">Requirements</a>
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<p>
        <span class="emphasis"><em>Header: </em></span><code class="literal">asio/ip/multicast.hpp</code>
      </p>
<p>
        <span class="emphasis"><em>Convenience header: </em></span><code class="literal">asio.hpp</code>
      </p>
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<td align="right"><div class="copyright-footer">Copyright &#169; 2003-2018 Christopher M. Kohlhoff<p>
        Distributed under the Boost Software License, Version 1.0. (See accompanying
        file LICENSE_1_0.txt or copy at <a href="http://www.boost.org/LICENSE_1_0.txt" target="_top">http://www.boost.org/LICENSE_1_0.txt</a>)
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